Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 242
NWS Storm Prediction Center Norman OK
425 PM MDT Fri May 26 2023
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southeastern Montana
Southwestern South Dakota
Northeastern Wyoming
* Effective this Friday afternoon from 425 PM until Midnight MDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Though isolated strong/severe thunderstorms are ongoing
over parts of the watch area, an increasingly organized plume of
convection should spread northeastward out of central/northern WY
through this evening. This activity will pose a threat for multiple
severe gusts and isolated large hail.
The severe thunderstorm watch area is approximately along and 95
statute miles east and west of a line from 50 miles north northwest
of Miles City MT to 55 miles south of Gillette WY. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 240...WW 241...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
21030.
...Edwards
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 242
NWS Storm Prediction Center Norman OK
425 PM MDT Fri May 26 2023
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southeastern Montana
Southwestern South Dakota
Northeastern Wyoming
* Effective this Friday afternoon from 425 PM until Midnight MDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Though isolated strong/severe thunderstorms are ongoing
over parts of the watch area, an increasingly organized plume of
convection should spread northeastward out of central/northern WY
through this evening. This activity will pose a threat for multiple
severe gusts and isolated large hail.
The severe thunderstorm watch area is approximately along and 95
statute miles east and west of a line from 50 miles north northwest
of Miles City MT to 55 miles south of Gillette WY. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 240...WW 241...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
21030.
...Edwards
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW2
WW 242 SEVERE TSTM MT SD WY 262225Z - 270600Z
AXIS..95 STATUTE MILES EAST AND WEST OF LINE..
50NNW MLS/MILES CITY MT/ - 55S GCC/GILLETTE WY/
..AVIATION COORDS.. 80NM E/W /45NNW MLS - 43NE DDY/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 21030.
LAT...LON 47080427 43540363 43540743 47080831
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.
Watch 242 Status Report Messages:
STATUS REPORT #4 ON WW 242
VALID 270235Z - 270340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 NE DGW TO
50 ESE GCC TO 40 SSE 4BQ TO 40 W 4BQ TO 10 E BIL.
..WENDT..05/27/23
ATTN...WFO...BYZ...GGW...UNR...RIW...
&&
STATUS REPORT FOR WS 242
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC003-011-017-025-033-075-079-087-103-109-270340-
MT
. MONTANA COUNTIES INCLUDED ARE
BIG HORN CARTER CUSTER
FALLON GARFIELD POWDER RIVER
PRAIRIE ROSEBUD TREASURE
WIBAUX
$$
SDC033-047-081-103-270340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER LAWRENCE
PENNINGTON
$$
WYC011-045-270340-
WY
. WYOMING COUNTIES INCLUDED ARE
CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 242
VALID 270135Z - 270240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 N DGW TO
5 S GCC TO 45 ENE SHR TO 35 SSE BIL.
..WENDT..05/27/23
ATTN...WFO...BYZ...GGW...UNR...RIW...
&&
STATUS REPORT FOR WS 242
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC003-011-017-025-033-075-079-087-103-109-270240-
MT
. MONTANA COUNTIES INCLUDED ARE
BIG HORN CARTER CUSTER
FALLON GARFIELD POWDER RIVER
PRAIRIE ROSEBUD TREASURE
WIBAUX
$$
SDC033-047-081-103-270240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER LAWRENCE
PENNINGTON
$$
WYC011-045-270240-
WY
. WYOMING COUNTIES INCLUDED ARE
CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 242
VALID 270030Z - 270140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 N DGW TO
20 S GCC TO 25 ESE SHR TO 50 WNW SHR.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 878
..WENDT..05/27/23
ATTN...WFO...BYZ...GGW...UNR...RIW...
&&
STATUS REPORT FOR WS 242
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC003-011-017-025-033-075-079-087-103-109-270140-
MT
. MONTANA COUNTIES INCLUDED ARE
BIG HORN CARTER CUSTER
FALLON GARFIELD POWDER RIVER
PRAIRIE ROSEBUD TREASURE
WIBAUX
$$
SDC033-047-081-103-270140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER LAWRENCE
PENNINGTON
$$
WYC005-011-045-270140-
WY
. WYOMING COUNTIES INCLUDED ARE
CAMPBELL CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 242
VALID 262335Z - 270040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..WENDT..05/26/23
ATTN...WFO...BYZ...GGW...UNR...RIW...
&&
STATUS REPORT FOR WS 242
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC003-011-017-025-033-075-079-087-103-109-270040-
MT
. MONTANA COUNTIES INCLUDED ARE
BIG HORN CARTER CUSTER
FALLON GARFIELD POWDER RIVER
PRAIRIE ROSEBUD TREASURE
WIBAUX
$$
SDC033-047-081-103-270040-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER LAWRENCE
PENNINGTON
$$
WYC003-005-011-019-033-043-045-270040-
WY
. WYOMING COUNTIES INCLUDED ARE
BIG HORN CAMPBELL CROOK
JOHNSON SHERIDAN WASHAKIE
WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (<5%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (20%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Mod (60%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
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